Filter-press.



A. M513. GRAY.

FILTER PRESS.

APPLICATION FILED SEPT. 28, 1910.

Patehted Apr. 1s, 1911.

g .ENTOIIR' t ATTORNEY.

WITNESSES M g6. 1%

parallel supporting bars than to the ring,

ring by radial bolts FILTER-PRESS.

Specification of Letters Patent.

Patented Apr. 18,1911.

Application filed SepteniberZS, 1910. Serial No. 584,177.

To all'whom it may concern: Be it known that I, Anxnsox Mo Do'wnnL GRAY, a citizen of the United States of ,America, residing-in Elizabeth, county of Union, State of New Jersey, have invented. a certain new and useful Improvement in Filter-Presses, of which the following is a specification.

he improvement comprising the subject matter of this invention relates to rings em ployed to separate the plates of a filter press and to form the chamber for the depositof solid matter left after expression or the fluid. The plates are formed with cars by means of which they are suspendedupon' along which they may move. The interposed rings are provided with similar lugs or cars for the same purpose.

The general construction of presses of this kind is well understood and any fur-- ther reference to any partthereof, other is quite unnecessary to an understanding of this invention.

Heretofore the carrying lugs or ears of filter press rings have-been attached to the or rivets. -Som'etin1es the lugs are castings and sometimes they are l formed by bars of metal bent to the-proper contour. Securing thelugs to the periphery of the ring by means of radial bolts or rivets is objectionable, among other reasons, be- 1 cause where the peripheral width of the ring is small, the bolting or riveting cannot be satisfactorily accomplished to afford adoquate strength of attachment without detriv in such distortion of the lugs as mentally affecting the strength of the ring. Brazing has, therefore, been resorted to. Experience has demonstrated, however, that the four necessary. brazing heats required a for uniting the ends of the, two lugs with the periphery of the ring not only results to throw the ring out of concentricity with the plates, but also the successive heating and cooling of the ring warps it or throws it out of true circular contour; and the rectification of shape of the lugs or the restoration of the ring to true circular shape is not only dillcult but is expensive.

The present invention comprises a filter press ring having lugs cut from sheet metal and secured in circumferential recesses cut in the ring. The lugs may be secured by tenacious when set. In the accompanying drawing:

rivets disposed par allel to. the axis of the propriate character such, for instance, as some one of themany alloys that melt at low temperature and are very hard and Figure '1 is a side elevation of a filter press ring having lugs applied thereto in accordance with this invention: Fig. 1 an elevation of one sideof the ring on an enlarged scale: F ig. 2, a side elevation of the lug detached from the ring: Fig. 3, av View looking at the periphery of the ring with the lug removed: Fig. 4-, a View similar to Fig.1 showing a modification: and Fig. 5, a view looking at the periphery of the ring seen in Fig. .4.

' The ring a is an ordinary filter press ring. The lug b may lac-stamped from or otherwise the lug has on its F 4 and 5 illustrate a modification that consists in milling in the ring a continuous circumferential groove e of uniform depth. The inner edge of the lug is correspondingly shaped to fit accurately in the recesses and the two parts are secured together by rivets (Z;

I claim:

1. A filter press ring having cut in its outer periphery circumferentially a recess,v a lug formed of sheet metal. and fitting in the recess and means for firmly uniting the lug and ring.

2. A filter outer, periphery circumferentially a' recess, a lug formed of sheet metal and fitting in the recess and rivets disposed in the direc tion of the axis of the ring and passing through it and the lug.

In testimony whereof, I have hereunto subscribed my name.

ALANSON MC DOVELL GRAY.

i tnesses L. F. Bnownms, MARY BUTTON.

ring or-by a pouring of molten metal of up formed of sheet metal. In the construction of Figs. 1 and 2, inner-edge three curved 13IO]6Ct10118 c, 0 0?. In

accurately fit the projecs press ring having cut. in its 

